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《Journal of Materials Engineering》 2004-04
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Effect of Heat Treatment on Properties of Nanoencapsulated Phase Change Materials

FAN Yao-feng, ZHANG Xing-xiang, WANG Xue-chen, NIU Jian-jin, CAI Li-hai (Institute of Functional Fibers, Tianjin Polytechnic University, Tianjin 300160, China)  
Nanoencapsulated phase change material (PCM) was prepared by in-situ polymerization with melamine-formaldehyde resin (M-F) shell. The core material was a mixture of n-octadecane and cyclohexane. The properties of the capsules were systematically studied through scanning electronic microscopy (SEM), differential scanning calorimeter (DSC), thermal gravimeter (TG) and infrared spectrometer (IR), etc. After they were heat-treated at different temperatures for 30-60 min. The results show that the average diameter of the capsule is approximately 0. 75 micron being in the range of nanocapsule. Heat treatment has significant effect on the morphology, phase change property and thermal stability of nanocapsule. A free expansion space inside the capsule is formed after the cyclohexane in the core diffuses out of the shell by heat treatment, and the free expansion space will increase the thermal stability of nanocapsule. The nanocapsule with best thermal stability and enthalpy can be obtained by heat treatment at a temperature from 160℃ to 180℃ for 30 minutes to 60 minutes. The enthalpy of nanocapsule is about 150J/g, and the thermal stability is approximately 215℃.
【Fund】: 国家自然科学基金资助项目(50073015)
【CateGory Index】: TB383
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